adjective Optics.
free from spherical aberration and coma.

1785–95; a-6 + Greek planá(ein) to wander + -tic. See planet

aplanatically, adverb
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World English Dictionary
aplanatic (ˌæpləˈnætɪk)
(of a lens or mirror) free from spherical aberration
[C18: from Greek aplanētos prevented from wandering, from a-1 + planētos, from planaein to wander]

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American Heritage
Medical Dictionary

aplanatic ap·la·nat·ic (āp'lə-nāt'ĭk)
Of or relating to an optical lens that is free from chromatic or spherical aberration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The case of aplanatic refracting surfaces is considered.
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